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I am working in C on a physics experiment, Young's interference experiment and I made a program who prints to file a huge bunch of pixels:
for (i=0; i < width*width; i++) { fwrite(hue(raster_matrix[i]), 1, 3, file); } Where hue, when given a value [0..255], gives back a char * with 3 bytes, R,G,B.
I would like to put a minimal header in my image file in order to make this raw file a valid image file.
More concise, switching from:
offset 0000 : height * width : data } my data, 24bit RGB pixels to:
offset 0000 : dword : magic \ : /* ?? */ \ 0012 : dword : height } Header <--> common image file 0016 : dword : width / : /* ?? */ / 0040 : height * width : data } my data, 24bit RGB pixels 
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An RGB file is a color bitmap image, saved in a file format created by Silicon Graphics (SGI). It contains binary data used to show an image using the RGB color model. RGB files are similar to . SGI files.
The PNG, JPEG, and GIF formats are most often used to display images on the Internet. Some of these graphic formats are listed and briefly described below, separated into the two main families of graphics: raster and vector.
JPEG (. JPEG files are very common on the Internet and JPEG is a popular format for digital cameras - making it ideal for web use and non-professional prints.
Web Graphics: PNG, JPEG and GIF are the most web friendly image formats there is. JPEG is great for images when you need to keep the size small, such as when you need to upload it online. If you don't mind compromising the quality of the image a bit, use JPEG.
You probably want to use the PPM format which is what you're looking for: a minimal header followed by raw RGB.
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